420-41 tooth aluminum sprocket to fit most pit bikes and minis including Pitster SSR Motovert SDG OGM RCM Thumpstar Extreme etc. Standard mount for the pit bike wheels on the market today. CNC cut from super strong 7075 aluminum alloy, these sprockets can handle today's high output engines. Available in Minimob black only while supplies last. Bolt holes measure 92mm across, center to center.